There are a couple things we love about this email example from PayPal. Not only is the opening copy clever and concise, but the entire concept also reflects a relatable benefit of using the service. Think about it: How many times have you been in a situation where you went out to dinner with friends and then fussed over the bill when it came time to pay? By tapping into this common pain point, PayPal is able to pique the interest of its audience. 
Not only is InVision's newsletter a great mix of content, but I also love the nice balance between images and text, making it really easy to read and mobile-friendly -- which is especially important, because its newsletters are so long. (Below is just an excerpt, but you can read through the full email here.) We like the clever copy on the call-to-action (CTA) buttons, too.
The enhanced tracking option links to your website through Salesforce or Google Analytics.  To use “auto-responders”, you must have a paid account – you can automatically trigger specific responses or segment users based on actions they take. After sending out your emails, MailChimp allows you to integrate your social channels to post regular updates on Twitter and Facebook.
I wondered, what are your thoughts on solutions like Mailigen, Vertical Response, Mad Mimi, and Campaign Monitor? I know there’s a never ending list of possible email software companies that you could compare, but these ones in particular interested me as they seem to offer many similar services to those that you mentioned. Have you come across them before, and if so would you advise using them over GetResponse?
Great companies are always evolving, and your customers expect to experience change. What they don't expect (because too many companies haven't lived up to this end of the bargain) is to be told about those changes. That said, this email from ModCloth serves as a refreshing change of pace. If you're going to change the way you communicate with a lead or customer, give them clear, fair warning so, if they aren't on board, they can make the necessary adjustments to keep their inbox clean.
Keep the subject line and pre-header short: The subject line is crucial. Keep it short so the reader knows exactly what the email topic is about. And the pre-header text (also known as snippet text), don’t let it go to waste by using “To view this email in your browser…”. Instead, summarize the email or include a call to action (i.e., Use “FREESHIP” to get free shipping).
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